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Related Experiment Videos

Fixation point offsets facilitate endogenous saccades

R A Abrams1, H M Oonk, J Pratt

  • 1Department of Psychology, Washington University, St. Louis, MO 63130, USA. rabrams@artsci.wustl.edu

Perception & Psychophysics
|April 8, 1998
PubMed
Summary
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The "gap effect" speeds up eye movements (saccades) even without alerting cues. This visual cue benefit applies to both visually guided and internally generated saccades, impacting early sensory processing.

Area of Science:

  • Neuroscience
  • Oculomotor research
  • Cognitive psychology

Background:

  • Saccades are rapid eye movements crucial for visual exploration.
  • The
  • gap effect
  • typically enhances saccade initiation when a visual fixation point disappears before a target appears.
  • Previous research suggested this effect is linked to alerting mechanisms.

Purpose of the Study:

  • To investigate the generality of the gap effect on saccade initiation.
  • To determine if the gap effect influences centrally produced (endogenous) saccades independently of alerting.
  • To compare the magnitude of the gap effect for endogenous versus visually elicited (exogenous) saccades.

Main Methods:

  • Participants performed saccades to targets signaled by auditory pitch, not location.

Related Experiment Videos

  • A visual fixation point was removed 200 ms before the auditory signal in a
  • gap
  • condition.
  • An alerting warning tone preceded the gap and signal in some trials to control for alerting benefits.

    • Main Results:

    • The gap effect facilitated endogenous saccade initiation even when alerting benefits were eliminated.
    • The gap effect was present for both endogenous and exogenous saccades, indicating broader applicability.
    • The gap effect was significantly smaller for endogenous saccades compared to exogenous saccades.

    Conclusions:

    • Visual fixation point offsets broadly facilitate saccade initiation by influencing oculomotor processes.
    • The gap effect's influence on endogenous saccades suggests it affects earlier sensory processing stages rather than solely motor preparation.